Mammary bud (IMAGE) University of Helsinki Caption Optical section of a confocal microscopy image of the mammary bud (marked with dashed line) stained with an epithelial marker in green at the time when ring cells form (left) and analysis of cell roundness of segmented cells with ring cells in dark blue (right). Credit Ewelina Trela Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.